Exchange 2016 Install Error ‘Skipping creating Discovery Arbitration Mailbox because of insufficient permission”

KB ID 0001221 


Note: Can also be seen on Exchange 2013.

While installing a new Exchange 2016 Server into a clients Exchange 2010 infrastructure last week, the setup failed with the following error.

Exchange Arbitration Permissions Error

A cutdown version of the error;

          Write-ExchangeSetupLog -Info ("Cannot find E-discovery arbitration mailbox with name=$name.");
          write-exchangesetuplog -info "Skipping creating Discovery Arbitration Mailbox because of insufficient permission."
        " was run: "Microsoft.Exchange.Data.DataValidationException: Database is mandatory on UserMailbox.
   at Microsoft.Exchange.Configuration.Tasks.Task.ThrowError(Exception exception, ErrorCategory errorCategory, Object target, String helpUrl)
   at Microsoft.Exchange.Configuration.Tasks.Task.WriteError(Exception exception, ErrorCategory category, Object target, Boolean reThrow)
   at Microsoft.Exchange.Configuration.Tasks.DataAccessTask`1.Validate(TDataObject dataObject)
   at Microsoft.Exchange.Configuration.Tasks.SetTaskBase`1.InternalValidate()
   at Microsoft.Exchange.Configuration.Tasks.SetRecipientObjectTask`3.InternalValidate()
   at Microsoft.Exchange.Management.Common.SetMailEnabledRecipientObjectTask`3.InternalValidate()
   at Microsoft.Exchange.Management.RecipientTasks.SetUserBase`3.InternalValidate()
   at Microsoft.Exchange.Management.RecipientTasks.SetMailboxBase`3.InternalValidate()
   at Microsoft.Exchange.Management.RecipientTasks.SetMailbox.InternalValidate()
   at Microsoft.Exchange.Configuration.Tasks.Task.b__b()
   at Microsoft.Exchange.Configuration.Tasks.Task.InvokeRetryableFunc(String funcName, Action func, Boolean terminatePipelineIfFailed)".

Click for the full Error.


This error is about arbitration mailboxes, so let’s have a look at those, (on my Exchange 2010 server, in the Exchange Shell).

Get-Mailbox –Arbitration | Select Name,Database

Exchange 2010 show arbitration

As you can see I’ve got a system mailbox that is not attached to any database, (the one with the yellow error under it). So I simply need to associate that with a mailbox database.

Set-Mailbox ‘{mailbox}’ –Database {Exchange-2010-Database} –Arbitration

Exchange 2010 Repair Arbitration Mailbox

Answer ‘A’ for ‘All’ when prompted.

Working Example

Set-Mailbox ‘SystemMailbox{e0dc1c29-89c3-4034-b678-e6c29d823ed9}’ –Database ‘Mailbox Database’ –Arbitration

Now check the arbitration mailboxes again, and there should be no errors.

Exchange 2010 Display Arbitration

Re-run setup.exe from the Exchange install media again, and the install should detect the failed one, and let you continue from the point of failure.

Exchange 2016 Incomplete Installation

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Author: PeteLong

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